PlayerAndroid/app/src/main/java/code/name/monkey/retromusic/loaders/SearchLoader.java

package code.name.monkey.retromusic.loaders;

import android.content.Context;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import java.util.ArrayList;

import code.name.monkey.retromusic.R;
import io.reactivex.Observable;

public class SearchLoader {

    public static Observable<ArrayList<Object>> searchAll(@NonNull Context context, @NonNull String query) {
        ArrayList<Object> results = new ArrayList<>();
        return Observable.create(e -> {
            if (!TextUtils.isEmpty(query)) {
                SongLoader.getSongs(context, query)
                        .subscribe(songs -> {
                            if (!songs.isEmpty()) {
                                results.add(context.getResources().getString(R.string.songs));
                                results.addAll(songs);
                            }
                        });

                ArtistLoader.getArtists(context, query)
                        .subscribe(artists -> {
                            if (!artists.isEmpty()) {
                                results.add(context.getResources().getString(R.string.artists));
                                results.addAll(artists);
                            }
                        });
                AlbumLoader.getAlbums(context, query)
                        .subscribe(albums -> {
                            if (!albums.isEmpty()) {
                                results.add(context.getResources().getString(R.string.albums));
                                results.addAll(albums);
                            }
                        });
            }
            e.onNext(results);
            e.onComplete();
        });
    }
}